Here's my two cents on how this game can be improved over RSE.
The main two problems with Hoenn I found were the lack of fire types that were GOOD outside of Blaziken (don't even start with Camerupt, he was just the best of a bad situation that included things like Magcargo), and the amount of "filler" Pokemon (Luvdisc, Poocheyana, etc.). I hope the regional dex is expanded so it includes more Pokemon from other gens.
Also, PLEASE give us Johto starters with Megas in a similar style to Kanto starters in XY, that'd be AWESOME.
Lastly, I'll be really mad if Sceptile and Swampert dont get megas, it makes no sense for it to only be Blaziken. If they don't, guess I'll just port over my blazikenite or something....
Rant end.